Double acting pump



Jan. 16, 1951 J. M. PRATT DOUBLE-ACTING PUMP Filed Jan. 10, 1947 Patented Jan. 16, '1951 UNITED; STATES ATENT OFFICE DOUBLE PUMP' F i i Application January 10, 1947, Serial No. '121,210

This invention relates to double acting pumps.

It is an object ofthe invention to provide a pump having novel provision for removal of the reciprocating portion frorn the stationary portion.

It is a further object to provide a gland removable with a reciprocable pump rod and provided 2 Claims. (Cl. 103-190) with a sealing coating on its exterior to prevent freezing of the gland with its seat.

It is a further object of the invention to provide a novel packing ring gland withmeans housing rigid material packing rings in operable relation to the pump rod. 1

Further objects will appear from the following description when read in connection with the accompanying drawings showing an illustrative embodiment of the invention and wherein Figure 1 .is a vertical central section through a portion of a pump; 1

Figure 2 is a detail vertical section, on an enlarged scale, showing the gland of Figure 1 and the taper of the'gland exaggerated;

Figure 3 is a plan view; and

Figure 4 is an edge view of one of the packing rings utilized in the invention.

As shown, the device comprises a pipe l having screw threaded connection with a barrel H which in turn has screw threaded connection with pipe I2. Mounted to reciprocate in the pipe if) there is shown the sucker rod 13 coupled by cage I l with the pipe [5 passing through gland iii.

The barrel H is shown as formed with inlet ports ll fitted with check valves 8. The barrel is shown as formed with a thickened portion l9 provided with passages 2!! controlled by pump valves 21.

Itwill be understood that the pipe i2 is provided with a foot valve or check valve at its lower end, not shown, and that the lower end of pipe I5 terminates above the said check valve and is itself provided with an upwardly opening check valve, shown in cage 14,- these check valves being conventional.

The sucker rod and pipe l5 are shown in Figure 1 at substantially the limit of their downward stroke.

The pipe [5 is shown as reciprocable in the gland it, which gland is in fluid-tight relation with seat 22 formed in the barrel I l, the external surface of the gland and the coacting surface of the seat being complementally' formed on the surface of a coneof slight angle.

To", prevent freezing of the gland to the seat and to assist in providing a fluid-tight joint, the gland is shown as provided with a layer or coating 24 desirably formed of a soft metal, solder being at present preferred. As shown, a slight recess 23 is shown as formed at the exterior of the gland for reception of the coating.

The valve at the lower end of the pipe [5 is of a size to permit it to pass easily through the seat 22. When the pipe Ill, barrel H and pipe l2 are in the well, the pipe l5 bearing its check valve and the gland l6 may be lowered by the sucker rod until the parts come to the position shown in Figure 1. The coupling 25 may then be caused to contact the gland to drive it to its seat. The

joints 29, 30.

valve casing at the lower end of pipe l5 may be utilized to break the gland from its seat for withdrawal.

To provide a liquid-tight seal about the pipe 15, the gland is formed with a plurality ofpacking rings 26 shown as formed of two sections 21,- 28 similar to each other, joining at tangential The combined sections are formed with a circumferential recess 3| to receive a contracting spring 32 formed with an inturned end 33 to enter a recess in the bottom of recess 3| as indicated in Figure 3. The spring 32 is shown as substantially semicircular, locking to section 28 and reacting upon section 21. V

The packing ring sections are preferably formed of rigid material as steel, cast iron or even molded plastic. The combined axial extent of the plurality of rings when assembled in the gland is such that when the plug 34 is screwed home upon a ring 35 and witha ring 36 below them, they willnot be frozen against slight movements of expansion and contraction to follow any slight difierences of the external diameter of pipe l5 in its different portions as it reciprocates.

valve, a check valve, and

. the'appended claims without departing from the I j spiritof the invention.

Y, [I claim:

1. A double acting pump comprising, in combination: a pump barrel provided with a pump a gland seat; a gland seating in saidgland seat, said glandand seat 'ormed with complemental frusto conical surfaces}; one of said surfaces formed with a recess "extending throughout a major portion of. its

axial extent and continuously about its per aridterminating-upwardly and downw dl coating'is formed of solder. .4

JESSE PRATT.

REFERENCES: CITED The following references of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Horsley Apr. 28, 1874 Martin et a1 Mar. 8, 1892 Shepard July 22, 1924 Esienhauer June 30, 1925 Pearce et a1 Sept. 20, 1927 Nairnan Feb. 11, 1930 

